This circuit was obtained from Electronics Now magazine, July 1995. The triac depends on the heating element current, and the sensor will determine the adjustment potentiometer.
This SCS counter circuit was found in a 1964 General Electric documentation. The circuit has a...
This simple 1-transistor reflex receiver was published in Radio Electronics magazine in September 1959....
Operational amplifiers used in this 80's circuit is not very common today, but the setting can be...